{HPO₃} and {WO₄} Simultaneously Induce the Assembly of Tri-Ln(III)-Incorporated Antimonotungstates and Their Photoluminescence Behaviors

Inorganic Chemistry, Journal Year: 2020, Volume and Issue: 60(2), P. 1037 - 1044

Published: Dec. 31, 2020

A double template agent strategy has been adopted to prepare a group of triacetate-adorned tri-Ln(III)-incorporated trimeric antimonotungstates (AMTs) K3Na21H[Ln3(CH3COO)3(HPO3)(WO4)][B-α-SbW9O33]3·36H2O [Ln = Eu3+ (1), Dy3+ (2), Ho3+ (3), or Er3+ (4)] in CH3COOH–CH3COONa buffer system. Therein, H3PO3 and Na2WO4·2H2O have been, respectively, transformed into the capped {HPO3} {WO4} tetrahedra during assembly process, which are situated at center polyoxoanions 1–4 simultaneously perform as structure-directing templates induce 1–4. The hexahedral configuration supramolecular stacking is same shape crystal 1, illustrates that mode plays significant role forming Under Ln3+ f–f excitation, photoluminescence behaviors involving emission spectrograms fluorescence decay curves were systematically researched. modulation excitation wavelength realized color tuning from blue red, green, yellow, green yellow for On basis O → W charge transfer (OWCT), energy-transfer procedure AMT units centers 1 mainly accomplished form energy reabsorption. This work proposes typical case construction new type clusters by using confirms great potential Ln-containing AMTs optic applications.

Language: Английский

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Discovery of two Na⁺-centered Silverton-type polyoxometalates {NaM₁₂O₄₂} (M = Mo, W)

Chemical Communications, Journal Year: 2021, Volume and Issue: 57(17), P. 2172 - 2175

Published: Jan. 1, 2021

Two new Silverton archetypes [NaM₁₂O₄₂]¹¹⁻ were demonstrated in the POMs Na₃[NaM₁₂O₄₂(Ru(DMSO)₃)₄]·13H₂O (M = Mo, W). The alkali metal Na⁺ ion incubated as a heteroatom is reported for first time and further certified by ²³Na NMR.

Language: Английский

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Trinuclear ruthenium core-containing polyoxometalate-based hybrids: preparation, characterization and catalytic behavior

Dalton Transactions, Journal Year: 2020, Volume and Issue: 49(9), P. 2895 - 2904

Published: Jan. 1, 2020

Two ruthenium-containing polyoxometalate-based hybrids (Ru-POMs), KH8[Ru3O(Trz)6Cl3]2[(NaO6)W6(H2O)6(AsW9O33)4]·28H2O (1) and H3[Ru3O(Trz)6Cl3]2[(WO)2W(OH)(AsW9O33)2]·6H2O (2), (Trz = 1,2,4-triazole), were successfully isolated by a one-step hydrothermal method under different acidic conditions further characterized single-crystal X-ray diffraction, powder diffraction (PXRD), IR spectroscopy, electrospray ionization mass spectrometry (ESI-MS), thermogravimetric (TG) analyses elemental analyses. Single-crystal reveal two polyanions comprised of four/two identical trivacant Keggin-type polyanion building blocks, leading to the formation tetrameric/dimeric assembly stabilized additional metal-oxo cores, respectively. ESI-MS shows that units [(NaO6)W6(H2O)6(AsW9O33)4]11- [(WO)2W(OH)(AsW9O33)2]5- are intact in mixed solvent. Moreover, heterogeneous catalysts with trinuclear ruthenium cations investigated, 1 was found exhibit much higher yield (94.1%)/conversion (95.1%) better selectivity (>99%) towards oxidation thioanisole sulfoxide than 2.

Language: Английский

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A systematic study of the optical properties of mononuclear hybrid organo–inorganic lanthanoid complexes

Inorganic Chemistry Frontiers, Journal Year: 2020, Volume and Issue: 7(17), P. 3049 - 3062

Published: Jan. 1, 2020

Mononuclear organic–inorganic hybrid lanthanoid complexes show that the combination of both types ligands improves optical response compared to inorganic analogue, thus having potential applications due their thermal response.

Language: Английский

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Oxalate-bridging Nd^III-based arsenotungstate with multifunctional NIR-luminescence and magnetic properties

Dalton Transactions, Journal Year: 2022, Volume and Issue: 51(26), P. 10257 - 10265

Published: Jan. 1, 2022

Oxalate bridged Nd-based arsenotungstate, K14Na6H4[{(As2W19O67(H2O))Nd(H2O)2}2(C2O4)]·64H2O (1), was obtained from the reaction of K14[As2W19O67(H2O)], oxalic acid, and NdCl3·6H2O in mildly acidic aqueous solution. The polyanion exhibits a dimeric structure which fully deprotonated oxalate ligands bridge two NdIII cations arsenotungstate anions act as blocking ligands. photoluminescence (PL) spectrum 1 shows characteristic emission peak near-infrared (NIR) region. However, O → W charge-transfer transitions cannot effectively sensitize confirmed by spectrum, due to mismatch energy gap between 3T1u 1A1g (21.57 × 103 cm-1) components 4F3/2 4I9/2 (11.43 cations. Magnetic studies demonstrate its field-induced single-molecule magnet (SMM) behavior. Direct current magnetic susceptibility imply weak ferromagnetic couplings present neighboring In addition, synergy coordination configuration intramolecular interaction discussed.

Language: Английский

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Two Innovative Fumaric Acid Bridging Lanthanide-Encapsulated Hexameric Selenotungstates Containing Mixed Building Units and Electrochemical Performance for Detecting Mycotoxin

Inorganic Chemistry, Journal Year: 2022, Volume and Issue: 61(28), P. 10965 - 10976

Published: July 6, 2022

Two particular fumaric acid bridging lanthanide-encapsulated selenotungstates [H2N(CH3)2]16Na8[Ln3(H2O)7]2 [W4O8(C4H2O4) (C4H3O4)]2[SeW6O25]2[B-α-SeW9O33]4·46H2O [Ln = Ce3+ (1), La3+ (2)] were acquired by the deliberately designed step-by-step synthetic strategy, which are composed of four trilacunary Keggin [B-α-SeW9O33]8- and two original [SeW6O25]10- building units together with one heterometallic [Ln3(H2O)7]2[W4O8(C4H2O4) (C4H3O4)]228+ entity. Particularly, this cluster contains ligands, play different roles: works as pendant decorating other acts linker connecting whole structure. In addition, 1@DDA hybrid material was produced through cation exchange 1 dimethyl distearylammonium chloride (DDA·Cl) its beehive-shaped film prepared breath figure method, can be further used to establish an electrochemical biosensor for detecting a kind mycotoxin-ochratoxin A (OX-A). The film-based exhibits good reproducibility specific sensing toward OX-A low detection limit 29.26 pM. These results highlight huge feasibility long-chain flexible ligands in structural complexity demonstrate great application potentiality polyoxometalate-involved materials bioanalysis, tumor diagnosis, iatrology.

Language: Английский

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H-shaped oxalate-bridging lanthanoid-incorporated arsenotungstates

Dalton Transactions, Journal Year: 2020, Volume and Issue: 49(44), P. 15731 - 15738

Published: Jan. 1, 2020

A series of oxalate-bridging di-Ln³⁺-incorporated H-shaped polyoxometalates were synthesized and their stability in solution was evidenced by Raman spectroscopy.

Language: Английский

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Magnetic field and dilution effects on the slow relaxation of {Er₃} triangle-based arsenotungstate single-molecule magnets

Dalton Transactions, Journal Year: 2020, Volume and Issue: 49(35), P. 12458 - 12465

Published: Jan. 1, 2020

A triangular {Er3} cluster containing polyoxometalate (POM), [Er3(μ3-OH)(H2O)8(AsW9O33)(AsW10O35(dl-mal))]222- (1) (mal = malate), has been obtained via one-pot reactions. Structural analyses demonstrate that three Er3+ ions bridged one μ3-OH to generate a rare μ3-OH-capped cluster, which connects two different vacant polyanions form an unsymmetrical sandwich-type subunit, and adjacent sandwiched subunits are linked through mal ligands give the targeted dimer. When substituted in whole or part with Y3+ ions, diamagnetic yttrium analogue [Y3(μ3-OH)(H2O)8(AsW9O33)(AsW10O35(dl-mal))]222- (2) diluted sample [Er0.15Y2.85(μ3-OH)(H2O)8(AsW9O33)(AsW10O35(dl-mal))]222- (Er@2) have also synthesized. Magnetic studies reveal 1 exhibits field-induced two-step magnetic relaxation processes; slow process may arise from intramolecular interactions, whereas fast is likely originate intermolecular dipole-dipole interactions supported by results of Er@2. From ab initio calculations, it found although anisotropies mainly individual fragments, Er3+-Er3+ considerable influence on their processes.

Language: Английский

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Synthesis, Characterization, and Catalytic Property of a Hybrid Nanoscale Polyoxoniobate

Journal of Cluster Science, Journal Year: 2020, Volume and Issue: 32(3), P. 613 - 620

Published: June 4, 2020

Language: Английский

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Odd-membered cyclic hetero-polyoxotitanate nanoclusters with high stability and photocatalytic H2 evolution activity

CHINESE JOURNAL OF CATALYSIS (CHINESE VERSION), Journal Year: 2021, Volume and Issue: 42(8), P. 1332 - 1337

Published: April 2, 2021

Language: Английский

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